package com.zhoukx.netty.protocoltcp;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;

import java.nio.charset.Charset;
import java.util.UUID;

public class MyServerHandler extends SimpleChannelInboundHandler<MessageProtocol> {

    private int count;
    @Override
    protected void channelRead0(ChannelHandlerContext ctx, MessageProtocol msg) throws Exception {
       // 接收到数据,并处理
        int len = msg.getLen();
        byte[] content = msg.getContent();

        // 将buffer转成字符串
        System.out.println("服务端接收到信息如下:");
        System.out.println("长度 :  " + len);
        System.out.println("内容: " + new String(content, Charset.forName("utf-8")));
        System.out.println("服务器收到数据包数量: " + (++count));

        // 回复消息
        String mes = UUID.randomUUID().toString();
        int length = mes.getBytes("utf-8").length;
        // 构建一个协议
        MessageProtocol messageProtocol = new MessageProtocol();
        messageProtocol.setLen(length);
        messageProtocol.setContent(mes.getBytes("utf-8"));

        ctx.writeAndFlush(messageProtocol);

    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {
        cause.printStackTrace();
        ctx.close();
    }
}
